"This is a disorder that affects millions of people, and I am one of them," the 41-year-old Oscar winner told People.

And she's one of them who's already doing her best to put not only a face, but a voice to the disorder.

"If my revelation of having bipolar II has encouraged one person to seek help, then it is worth it," she said. "There is no need to suffer silently and there is no shame in seeking help."

Earlier this month, the mother of two and wife of Michael Douglas checked into Silver Hill Hospital, a facility in New Canaan, Conn. She remained in the facility for five days while she sought treatment.